Originally Posted by ShadowSpawn666
I am not to worried about the cost of it I was just wondering about what people thought about the heat properties and the malleability of it.
thermally speaking. aluminum will not perform better then steel if proper airflow is engineered into the case.
the only time aluminum will have an advantage over steel is if the case is designed to be a heatsink and the heat is actually channeled onto the aluminum for that purpose. perfect example would be a case that is no longer in production (TNN500AF) it's no longer in production because the price tag was $1000 to $1200
aside from extreme examples like the TNN500AF, the material the case is made from does not matter as long as you have good airflow pattern designed into the chassis. aluminum is more of an aesthetic choice rather then a performance choice when it comes to computer cases. (reason why you don't see aluminum server cases where performance is all that matters)
if you are going to build a custom chassis and decide to go with aluminum, you don't have to use milled steel for the mobo tray, you simply need thicker aluminum. something like a 4mm thick aluminum plate would more then suffice as a mobo tray and will offer superior rigidity then the typical thinner steel counter part.